Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2007
Sammendrag
The aim of this study was to use Energy-Dispersive X-ray Spectroscopy (EDS) to localize chitosan in the cell wall of chitosan impregnated Scots pine. It is of both general and specific interest to investigate the concentration of chitosan in the wood matrix to gain further knowledge and understanding of chitosan as a wood protective system.After deacetylation, chitosan was re-acetylated with chloroacetic anhydride to achieve a covalent bonding of chloride to the chitosan polymer. Chloride labeled chitosan was measured by EDS using a Scanning Electron Microscope (SEM) and described in apparent concentration of chloride. Analysis for free chloride anions was tested by dialysis and ion chromatography.There was a significant correlation between the molecular weight of chitosan and the apparent concentration of covalent bonded chloride to the chitosan polymer. High molecular weight chitosan showed a better interaction with the cell wall structure than low molecular chitosan.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Ein LC-MS/MS metode for å bestemme 11 fytoøstostrogesambindingar vart utvikla og validert. Alle 11 kunne påvisast i kumjølk.
Sammendrag
An LC-MS/MS method for determination of 11 phytoestrogens was developed and validated. All was demonstrated presencet in dairy milk.
Sammendrag
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Forfattere
Stig Morten Thorsen Lars Egil HaugenSammendrag
In the process of studying how climatic changes will influence important forage crops at high latitudes, van Oijen et al. (2005) developed a plant model for two grass species, timothy (Phleum pratense L.) and perennial ryegrass (Lolium perenne L.). In order to study winter survival of the plants, the plant model requires routines to simulate winter conditions, such as snow accumulation, soil frost, ice cover and soil temperature. This report describes the development of the SnowFrost model that simulates snow accumulation and the formation of soil frost. Routines for simulating ice encasement will be added at a later stage. The SnowFrost model implements a degree-day-temperatureindex method in the snowmelt routines, and an energy balance approach to get an algebraic expression for soil frost formation. Our main focus when developing the winter model is to adequately simulate winter conditions from the plant's point of view, rather than accurately simulate the depths of snow cover and soil frost penetration. Simulations for a site with cold and stable winter conditions show promising results, and indicate that SnowFrost is suitable as a foundation for the continuing work of developing the winter routines for the plant model.
Forfattere
Tor J. JohansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Tor J. JohansenSammendrag
Studies have focused on the progress of diapause and post-diapause development in one early- and one late-emerging population of D. floralis at various temperatures. For the early emerging biotype, diapause progressed gradually at low temperatures and terminated in late spring. For the late emerging biotype also, diapause progressed gradually for a certain period, but did not end, no matter the duration of chilling. For both populations, diapause developed faster at constant 18 ºC compared to combinations with chilling periods, implicating that chilling was not a prerequisite for diapause development. For the late emerging population, results indicated a second phase of diapause development with a threshold temperature of about 7 "C. However, the rate of this second phase development did not increase linearly with temperatures but had an optimum at about 12 "C. Post-diapause development for both populations was similar and had a lower threshold of about 2 "C. Results explain how delayed emergence in some populations are regulated.